Answer
$\frac{\ln_{15}}{\ln_{2}} = 3.9069$
Work Step by Step
Change of base formula: $\log_{b}x = \frac{\log_{a}x}{\log_{a}b}$
$\log_{2}15 =\frac{\ln_{15}}{\ln_{2}} $
$\frac{\ln_{15}}{\ln_{2}} = 3.9069$
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